CDN 缓存
使用CDN之后，文件如何更新
1，主动推送文件到CDN节点 https://help.aliyun.com/knowledge_detail/40106.html?spm=5176.10695662.1996646101.searchclickresult.5e9c8434pZrMKc
2，如何查看一个URL是否命中CDN缓存 https://help.aliyun.com/knowledge_detail/40122.html?spm=5176.10695662.1996646101.searchclickresult.7eba62c217Sul0
3，CDN缓存命中率下降的因素有哪些？ https://help.aliyun.com/knowledge_detail/40191.html?spm=5176.7840185.2.3.YqYkHV https://help.aliyun.com/knowledge_detail/40108.html?spm=5176.7840208.2.7.JHv58m
4，CDN节点默认缓存策略 https://help.aliyun.com/knowledge_detail/47580.html
5，CDN缓存配置 https://help.aliyun.com/document_detail/27136.html?spm=5176.doc62975.6.581.mQUede
6，CDN刷新缓存 https://help.aliyun.com/document_detail/27140.html?spm=5176.doc27136.6.596.PhRGHK
7，CDN设置某个目录或文件不缓存 https://help.aliyun.com/knowledge_detail/40192.html?spm=5176.11065259.1996646101.searchclickresult.33dd794cqcgQ4P
